vasilito
965141d67c
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
98 lines
4.0 KiB
Markdown
98 lines
4.0 KiB
Markdown
# KDED
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Central daemon of KDE work spaces
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## Introduction
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KDED stands for KDE Daemon which isn't very descriptive.
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KDED runs in the background and performs a number of small tasks.
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Some of these tasks are built in, others are started on demand.
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### Built in tasks
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* Checking for newly installed software and updating ksycoca when new
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software is detected. Updating of ksycoca is done by the program kbuildsycoca
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which gets started by kded. When kded is first started it always runs
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kbuildsycoca to ensure that ksycoca is up to date.
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* Checking for newly installed update files. Applications can install
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\*.upd update files. These \*.upd files are used to update configuration files
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of users, primarily when new versions of applications are installed with
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(slightly) different configuration file formats. Updating of configuration
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files is done by kconf\_update. kded starts kconf\_update when it detects a
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new update file. When kded is first started it always runs kconf\_update to
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ensure that it has not missed any update files. kconf\_update keeps track
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of which update files have been processed already in the config-file
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kconf\_updaterc. It only performs a certain update once.
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### Configuration of built in tasks.
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The built in tasks have some configuration options that can be changed by
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editing the kdedrc configuration file. Changes need to be made with a text
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editor, there is no GUI available. All options are listed under the [General]
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group:
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**HostnamePollInterval**: This can be used to adjust the time interval at which
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the hostname is checked for changes. The time is specified in milliseconds
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and has a default of 5000 (5 seconds).
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**CheckSycoca**: This option can be used to disable checking for new software.
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ksycoca will still be built when kded starts up and when applications
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explicitly request a rebuild of the ksycoca database. The user can
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also manually rebuild ksycoca by running the kbuildsycoca program.
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The default value of this option is "true". Checking can be disabled by
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setting this option to "false".
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**CheckUpdates**: This option can be used to disable checking for update files.
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kconf\_update will still be run when kded starts up.
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The default value of this option is "true". Checking can be disabled by
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setting this option to "false".
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**CheckHostname**: This option can be used to disable checking for hostname
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changes. The default value of this option is "true". Checking can be
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disabled by setting this option to "false".
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Example kdedrc file with default values:
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[General]
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HostnamePollInterval=5000
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CheckSycoca=true
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CheckUpdates=true
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CheckHostname=true
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CheckFileStamps=true
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DelayedCheck=false
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If FAM or DNOTIFY is not available, the filesystem will be polled at regular interval for any changes. Under the [DirWatch] group in the kdeglobals file
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the following options are available to adjust the polling frequency:
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**PollInterval**: This can be used to adjust the time interval at which the local
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filesystem is checked for new software or update files. The time is specified
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in milliseconds and has a default of 500 (0.5 seconds).
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**NFSPollInterval**: This can be used to adjust the time interval at which remote
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filesystems, such as NFS or Samba, are ebing checked for new software or
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update files. The time is specified in milliseconds and has a default of 5000
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(5 seconds).
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The above options are not used when FAM is used to watch for changes in the
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filesystem, or when DNOTIFY is used. Specifying larger intervals may reduce
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the CPU load and/or network traffic. Shorter intervals are not recommended.
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Please note that in previous versions of KDE these options where listed in
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the kderc file.
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Example kdeglobals fragment:
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[DirWatch]
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PollInterval=500
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NFSPollInterval=5000
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### KDED modules
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Some things can be greatly simplified if they can be coordinated from a
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central place. KDED has support for modules that will be demand-loaded
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whenever an application attempts to make DBus call to the module.
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This can be useful for central administration tasks.
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See docs/HOWTO.
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